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A super-resolution imaging method for forward-looking sea surface target angles under sea clutter background

A technology of super-resolution imaging and sea clutter, which can be used in radio wave measurement systems, reflection/re-radiation of radio waves, and use of re-radiation, etc., and can solve problems such as noise amplification and target misalignment.

Active Publication Date: 2017-04-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of target dislocation and noise amplification in the existing airborne forward-looking sea surface target angle super-resolution imaging technology, and propose a forward-looking sea surface target angle super-resolution imaging method under the background of sea clutter

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  • A super-resolution imaging method for forward-looking sea surface target angles under sea clutter background
  • A super-resolution imaging method for forward-looking sea surface target angles under sea clutter background
  • A super-resolution imaging method for forward-looking sea surface target angles under sea clutter background

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Embodiment Construction

[0088] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0089] In order to describe content of the present invention conveniently, at first the following terms are explained:

[0090] (1) Radar angle super-resolution

[0091] Radar angle super-resolution refers to the method of radar through signal processing, which breaks through the inherent resolution limit of the imaging system and achieves high resolution in azimuth.

[0092] (2) Real beam scanning radar

[0093] The real beam scanning radar is a radar that transmits the antenna beam by mechanical rotation, so that the beam scans the scene target uniformly or non-uniformly in azimuth.

[0094] (3) Sea Clutter

[0095] In the field of radar, the echo signal reflected from the sea surface is called sea clutter, which is determined by the wave, wind speed, direction of the wave relative to the radar beam, duration, appearance of wave crest, low tide, hig...

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Abstract

The invention discloses a forward-looking sea surface target angle super-resolution imaging method under the background of sea clutter. According to the convolution characteristic of the azimuth dimension echo of the scanning radar, the scanning radar echo signals are rearranged into the azimuth dimension according to the order of the distance dimension. The product form of the vector and the convolution measure matrix. Then, according to the characteristics that the sea clutter obeys the Rayleigh distribution and the sea surface target obeys Laplace, the maximum a posteriori objective function for solving the original scene distribution is constructed on the basis of the Bayesian formula, and the iterative equation is constructed by using the obtained maximum a posteriori solution. Invert the original sea surface target distribution to achieve angular super-resolution imaging. The present invention uses Rayleigh distribution to characterize sea clutter characteristics, Laplace distribution to characterize target characteristics, deduces the iterative expression of convolution inversion problem under Bayesian criterion, realizes the reconstruction of the original imaging scene, and obtains A high-resolution image of the azimuth of a forward-looking sea surface target.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to the design of a super-resolution imaging method for forward-looking sea surface target angles under the background of sea clutter. Background technique [0002] The high-resolution imaging of the airborne platform's forward-looking sea area has huge application requirements in the fields of sea detection and imaging, sea surface target search and rescue, ship formation recognition, and ship attack. However, because the Doppler bandwidth generated by the movement of the target and the airborne platform in the forward-looking area is too narrow, it is impossible to use synthetic aperture radar (SAR) and Doppler beam sharpening (DBS) to achieve high target azimuth in the forward-looking area. resolution imaging. Therefore, airborne radar usually uses scanning sampling to obtain real beam echo signals in the forward-looking area. Since the transmitted signal of th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
CPCG01S7/414G01S13/89
Inventor 张寅王月黄钰林查月波杨建宇武俊杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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